That she was even able to compete in the final of the last grand slam of the year was a minor miracle in itself. That she played near-perfect tennis to win 7-5 6-1 is the stuff of folklore.
It was a performance that won the 21-year-old a cool $1 million but, to Henin-Hardenne, it was priceless.
While Clijsters had been tucked up in bed on Friday night, Henin had been locked in battle with a tigerish Jennifer Capriati in a three-hour semifinal stretching into the early hours of finals day.
Such was the state of Henin-Hardenne as she limped off court to a standing ovation that there were very real fears she would not be able to take her place on court for the Super Saturday showdown.
But 21-year-old Henin-Hardenne is hewn from tougher stuff than that.
The determination she showed comes as no surprise to anyone who knows her, for her sublime God-given talent is backed by a steely temperament.
It is a temperament that steered her to beat Clijsters in the final of the French Open earlier this year and one which on Saturday made Clijsters’ world number one ranking appear little more than an arithmetical error.
Clijsters had looked unstoppable throughout the tournament. She had not lost a set on her way to the final. In fact she had not lost more than six games in any match over the fortnight.
But under the floodlights on Arthur Ashe Stadium Court, Henin-Hardenne made her look clumsy and inept.
In fairness, though, there are few players in the history of the sport who could share a spotlight with Henin-Hardenne when she is on form.
On Saturday, she was on fire.
The Henin-Hardenne backhand has always been a thing of beauty. From the moment she stepped onto centre court it was jaw-dropping.
Rolling the ball crosscourt or down the line with equal grace and power, Henin-Hardenne raced into a 3-0 lead.
There was little sign of the exhaustion that had all-but scuppered her chances earlier in the day as she scampered around the court.
The 20-year-old Clijsters, who despite her ranking is gaining a reputation for folding in the big matches, scrapped back and even managed to overhaul her opponent for a 5-4 lead.
But Henin-Hardenne reeled off three straight games to clinch the opener in 51 minutes when Clijsters ploughed a forehand into the net for her 30th unforced error.
It was the first set dropped by Clijsters the entire tournament and the spell was well and truly broken.
Henin-Hardenne started the second set the way she began the first with a pair of breaks on way to another 3-0 lead.
This time she didn’t offer Clijsters any chance to get back into the match, holding serve to go 4-0. Clijsters finally stopped the skid by holding serve at 4-1 but the road back was too far, Henin-Hardenne finishing off her compatriot with another break.—Reuters